Economic methodology

· Economics uses the scientific method imperfectly: economists study a complex social world, so conclusions are often probabilistic, not certain.
· Positive economics = objective, testable statements about what is. In exams, look for claims that can be checked against evidence.
· Economists use logic to build arguments from assumptions to conclusions.
· They form hypotheses, simplify reality with models, and develop broader theories.
· Models are useful because they isolate the key variables, but they are never a complete picture of reality.
· Ceteris paribus = other things being equal. It lets economists analyse the effect of one variable at a time.
· Economists test ideas using empirical evidence such as data, trends, case studies, and real-world outcomes.
· A good economic claim must be open to refutation: if evidence contradicts it, the claim or model must be reconsidered.
· Exam tip: when evaluating methodology, balance usefulness of simplification against loss of realism.

This diagram shows how economists use models to simplify reality and map relationships between key agents. It is useful for remembering that economic analysis often focuses on selected variables rather than every real-world detail. Use it as a reminder that models are valuable because they clarify patterns, but they also omit complexity. Source

Positive vs normative economics

· Normative economics = value judgments about what ought to be.
· Normative statements often include words like should, fair, better, worse, desirable, or unacceptable.
· Policy making usually combines both:
· Positive analysis predicts likely consequences.
· Normative analysis judges whether those consequences are acceptable.
· Equity = fairness in distribution.
· Equality = people receive the same amount or treatment.
· In essays, do not treat equity and equality as identical.
· A policy can increase equality without necessarily improving equity, and vice versa.
· Exam tip: classify statements carefully before evaluating them — many questions mix facts with value judgments.

Historical development of economic thought

· Learn the broad timeline, not every detail: the exam wants context, core ideas, and the ability to connect schools of thought to policy debates.
· 18th century – Adam Smith and laissez-faire:
· argued for a stronger role of markets and limited government interference in many cases.
· linked self-interest and market coordination to improved outcomes through the price mechanism.
· 19th century – Classical microeconomics:
· growing focus on utility and how individuals make choices.
· development of the concept of the margin: many decisions are made by comparing extra benefit with extra cost.
· 19th century – Classical macroeconomics / Say’s law:
· emphasized the tendency of markets to move toward equilibrium.
· Marxist critique challenged classical economics by focusing on class conflict, power, and exploitation within capitalist systems.
· 20th century – Keynesian revolution:
· argued that economies can get stuck with insufficient aggregate demand and persistent unemployment.
· justified a much larger role for macroeconomic policy, especially government intervention.
· 20th century – Monetarist / new classical counter-revolution:
· re-emphasized markets, expectations, limits of government policy, and the importance of controlling inflation.
· 21st century – behavioural economics and interdisciplinary thinking:
· economics increasingly draws on psychology because people do not always behave as fully rational decision-makers.
· there is growing focus on interdependence between the economy, society, and environment.
· this has increased interest in ideas such as the circular economy.
· Exam tip: in evaluation, refer to different schools to show that economics contains debate, not one fixed truth.

This portrait is a useful visual cue for Adam Smith and the rise of laissez-faire thinking in the 18th century. It helps anchor the historical starting point of modern economics in exam answers. Mention Smith when discussing the case for markets and limited intervention. Source

This image represents John Maynard Keynes, whose ideas transformed macroeconomics in the 20th century. Use Keynes as the key reference point when explaining why economists began to support stronger government intervention during downturns. It is especially helpful when contrasting classical and Keynesian thinking. Source

Behavioural economics and modern perspectives

· Behavioural economics questions the assumption that people are always fully rational.
· It studies how biases, heuristics, framing, habits, and emotions affect decisions.
· This matters because real-world consumers, workers, firms, and voters may behave differently from what simple models predict.
· Modern economics increasingly works with psychology, politics, history, and environmental thinking.
· A strong modern answer shows that economics is both a social science and an evolving discipline.
· The syllabus also highlights awareness of the links between economic activity, society, and the environment.
· This supports interest in moving toward a circular economy, where resource use is reduced, reused, and redesigned for sustainability.

This diagram visualises a wide range of cognitive biases, showing why behavioural economists argue that people do not always make perfectly rational choices. Use it to remember that real decision-making can be affected by shortcuts, framing, and imperfect judgment. It supports evaluation of the limits of traditional models. Source

This diagram illustrates the circular economy, where production and consumption are redesigned to reduce waste and keep resources in use longer. It connects directly to the syllabus emphasis on the growing awareness of interdependence between the economy, society, and the environment. Use it when explaining how 21st-century economics increasingly includes sustainability concerns. Source

How to write about methodology in exams

· Define the method first: positive, normative, model, ceteris paribus, or empirical evidence.
· Then apply it to a real or hypothetical issue, showing how economists would analyse the problem.
· For evaluation, explain both strengths and limitations.
· Strong points: clarity, testability, structured thinking, and use of evidence.
· Weak points: simplifying assumptions, difficulty controlling variables, and changing human behaviour.
· Useful evaluation phrases:
· This model is useful because…
· However, its assumptions may be unrealistic because…
· The conclusion depends on the ceteris paribus assumption…
· The policy judgment is normative because…

Common exam traps

· Confusing positive with normative.
· Treating equity and equality as the same concept.
· Describing a model without explaining why economists use it.
· Forgetting that evidence can refute a theory.
· Memorising economists’ names without linking them to a core idea or policy implication.
· Writing that economics gives exact answers like a natural science, instead of recognising uncertainty and debate.